<!--
 * @Author: summer12138 1343364145@qq.com
 * @Date: 2023-05-20 21:35:18
 * @LastEditors: summer12138 1343364145@qq.com
 * @LastEditTime: 2023-05-20 21:52:58
 * @FilePath: \Vue核心技术与实战 - 作业\作业day02\买点书练习.html
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
-->
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="app">
    <div>
      <p>请选择你要购买的书籍</p>
      <ul>
        <li v-for="item in arr">{{item.name}} <button @click="add(item.name)">购买</button></li>
      </ul>
      <table border="1" width="500" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>书名</th>
          <th>单价</th>
          <th>数量</th>
          <th>合计</th>
        </tr>
        <tr v-for="(item,index) in arr">
          <td>{{index+1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.price}}</td>
          <td>{{item.count}}</td>
          <td>{{item.count*item.price}}</td>
        </tr>
      </table>
      <p>总价格为:{{total}} </p>
    </div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        arr: [
        {
          name: "水浒传",
          price: 107,
          count: 0,
        },
        {
          name: "西游记",
          price: 192,
          count: 0,
        },
        {
          name: "三国演义",
          price: 219,
          count: 0,
        },
        {
          name: "红楼梦",
          price: 178,
          count: 0,
        },
      ],
      },
      methods: {
        add(i){
          this.arr.forEach(item=>item.name==i?item.count++:item.count)
        }
      },
      computed: {
        total(){
          return this.arr.reduce((a,b)=>a+b.count*b.price,0).toFixed(2)
        }
      },

    })
  </script>
</body>
</html>